From: Longfang Liu liulongfang@huawei.com

mainline inclusion from mainline-v5.11-rc5 commit 643a4df7fe3f6831d14536fd692be85f92670a52 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I4CDK3?from=project-issue CVE: NA

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The system that use Synopsys USB host controllers goes to suspend when using USB audio player. This causes the USB host controller continuous send interrupt signal to system, When the number of interrupts exceeds 100000, the system will forcibly close the interrupts and output a calltrace error.

When the system goes to suspend, the last interrupt is reported to the driver. At this time, the system has set the state to suspend. This causes the last interrupt to not be processed by the system and not clear the interrupt flag. This uncleared interrupt flag constantly triggers new interrupt event. This causing the driver to receive more than 100,000 interrupts, which causes the system to forcibly close the interrupt report and report the calltrace error.

so, when the driver goes to sleep and changes the system state to suspend, the interrupt flag needs to be cleared.

Signed-off-by: Longfang Liu liulongfang@huawei.com Acked-by: Alan Stern stern@rowland.harvard.edu Link: https://lore.kernel.org/r/1610416647-45774-1-git-send-email-liulongfang@huaw... Cc: stable stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Longfang Liu liulongfang@huawei.com Acked-by: Xie XiuQi xiexiuqi@huawei.com Reviewed-by: Cheng Jian cj.chengjian@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/usb/host/ehci-hub.c | 4 ++++ 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c index ce0eaf7d7c12a..a99c1ac5d8c8b 100644 --- a/drivers/usb/host/ehci-hub.c +++ b/drivers/usb/host/ehci-hub.c @@ -346,8 +346,12 @@ static int ehci_bus_suspend (struct usb_hcd *hcd)

unlink_empty_async_suspended(ehci);

+ /* Some Synopsys controllers mistakenly leave IAA turned on */ + ehci_writel(ehci, STS_IAA, &ehci->regs->status); + /* Any IAA cycle that started before the suspend is now invalid */ end_iaa_cycle(ehci); + ehci_handle_start_intr_unlinks(ehci); ehci_handle_intr_unlinks(ehci); end_free_itds(ehci);